Discharger for centrifugal machines



Sept. 5, 1939. P. VAN RIE-L DISGHARGER POR CENTRIFUGAL MACHINES 'HF-Ggf y Original Filed June 29, 1937 F IGA Fle Patented Sept. 5, 1939 UNITED STATES DISCHARGER FOR CENTRIFUGALA MACHINES Pieter van Riel, Delft, Netherlands, assigner to v N. V. Machinefabriek Reineveld, Delft, Netherlands, a company of the Netherlands Application June 29, 1937, serial No.,151,032.

Renewed February 14, 1939. In Germany July 4 Claims.

The invention relates to means for emptying the revolving drum ofva centrifugal machine.

It has already been suggested to provide the drum of a centrifugal machine with means for removing the substantially solid material accumulated on the inner drum wall, said means consisting of a plurality of disks having a smooth circumferential cutting edge and assembled on a shaft mounted in substantially parallel relation with the axis of the drum and adapted for movement towards and away from said inner wall.

In accordance with my present invention, said disks, at least part of them, are toothed or otherwise provided along their circumference with a series of recurrent projections and recesses, and

are freely revoluble relative to one another.

When the said disks are drawn into frictional engagement with the material which has been impinged against the inner wall of the revolving centrifugal drum, they are compelled to follow said rotary movement, so that the cylindrical body formed by the coaxial disks disintegrates the material and allows the particles thereof to be removed from the drum.

The drawing illustrates, by way of example only, an embodiment of my present invention. On this drawing:

Fig. 1 is a vertical axis sectional view of part of a horizontal centrifugal machine,

Fig. 2 is a fragmentary sectional view along the line II-II in Fig. l,

Fig. 3 is a front view of a detached disk, drawn on an enlarged scale, and

Fig. 4 is a side elevational view of three disks,

showing the relative positions they may assume during operation.

Mounted within the stationary housing 5 of the centrifugal machine is the revoluble drum or basket 6. Rotatably mounted in a bearing 'I of said housing 5 is the casing 8 of a screw conveyor 9, the axis of which is in parallel relation with the axis of the drum 6. The shaft of the screw conveyor 9 is designated by I0.

Secured to the casing 8 are two radial arms 8a, 8b supporting a shaft II mounted in parallel relation with shaft I0. Freely revoluble about shaft II are a plurality of disks I2a, I2b, I2c of equal sizes, each disk being provided with a circumferential series of radial fingers I3 of very hard material and of U-shaped cross-section.

The cylindrical body formed by these disks extends through the full axial length of the drum 6. The disks I2 may be and preferably are provided with a bushing I I on which the disks are freely rotatable. The disks may be and preferably are separated by more or less resilient spacing elements I2', shown more particularly in Figure 4.

The casing 8 is adapted by mechanism not shown on the drawing to be oscillated through a suitable angular distance in such a manner that the cylindrical body I2 composed of disks I2a, |21), I2c and associated therewith moves towards or away from the inner drum wall. 'Ille shaft IB is coupled with a transmission not shown, 10 so that the screw conveyor can be driven at a suitable speed. The casing 8 is further provided with an axial slot I4 adapted to receive the stream of disintegrated material disengaged by the disks I2a, |22), I2c from the inner wall 15 of the drum.

If, owing to the normal function of the centrifugal machine, a substantially solid layer of sufficient thickness has accumulated on the inner wall of the fastly revolving drum 6, the fee-d 20 of the machine is cut off and the casing 8 turned, until the cylindrical body I 2 contactsv with said layer. The disks I2a, I2b are thus compelled by frictional engagement to follow the rotary movement of the drum, so that their n- 25 gers. I3 act to disintegrate the material. The disintegrated material is thrown, tangentially relative to the cylinder I2, through the slot I4 into the casing B, from which it is discharged by the screw conveyor 9. 30

referably, the outer ends of arms 8a, IZb are formed as hooks, scrapers or the like extending circumferentially of the cylinder I2, so that the solid material accumulated on the inner drum Wall is also scraped off in the radial planes of 35 said arms, i. e. in the regions beyond the reach of the disks I2a, |217 The disks provided with recurrent projections and recesses along their circumference may a1- ternate with disks of relatively soft material and 40 having a smooth circumference. As stated, the essential feature of my invention is that the cylindrical body I2 on Shaft Il is composed of disks that are freely revoluble relative to one another and that they are provided with a cir- 45 cumferential series of teeth or like projections adapted to disintegrate the material when the disks are brought into frictional engagement with the layer of solid material accumulated on the inner drum wall. 50

Preferably, the axis of the cylindrical body I2 is mounted So as to make a very small angle with the axis of the drum.

It will be understood that my invention is equally Suitable for a centrifugal machine hav- 55 ing a perforated drum as for a centrifugal separator, the drum of which has an impervious Wall. Moreover, it will be obvious to any one skilled in the art that the cylindrical body I2 may also be mounted so as to be adapted for rectilinear reciprocatory movement, the only requireshaft, the series of disks being bodily movable into and out of contact with the interior surface of the drum by adjustment of the cylindrical body.

2. A construction as dened in claim l, Wherein the peripheral surfaces of the disksare formed with spaced material removing projections.

3. A construction as` defined in claim l, wherein the cylindrical body is formed with an opening facing the disks to receive part of the material removed by the disks, and means within the cylindrical body for compelling discharge movement of the received material.

4. A construction as dened in claim 1, wherein the disks together provide an operative length substantially equal to the axial length of the drum.

PIETER VAN RIEL. 

